These weights are actually Weck reusable Glass Lids and they are excellent for weighing down your ferment. Made of the highest quality glass, they contain NO BPA! (Bisphenol A), lead, mercury or cadmium.
We carry them in the small and medium sizes. Small = 70mm wide 4mm thick, Medium = 90mm wide 4mm thick.
If you are using one of our Weck fermenting jars, choose small for the 1 litre jars and medium for the 1.5 litre jars.
For the Ball 2 litre jars you can use the small weight but due to the width of the shoulders there will not be a full coverage of the surface. In this instance you can use vegetables such as cabbage leaves or strips of carrot peel to cover the surface and then weight this with the small weight.